EDEN PRAIRIE, Minn. -- Christian Ponder returned to practice on Friday morning, but the rookie quarterback's reps were limited and the Minnesota Vikings listed him as questionable for Sunday's game at Detroit.

Halfback Adrian Peterson also was listed as questionable with his high ankle sprain after participating on a limited basis for a second consecutive day.

"That was encouraging that both of those guys were able to get some work," coach Leslie Frazier said.

The questionable designation on the injury report means a player has a 50% chance for playing.

Asked if the Vikings might work out both players before Sunday's game, Frazier said, "Just watching Adrian, I don't think if it's going to be necessary. We'll be able to make a decision based off of what we've seen the last couple days.

"Christian, the fact that (Friday) was his first day, if we decided to go forward with him, we'd probably want to see him move around again after a slow day (in Saturday's walkthrough)."

Backup quarterback Joe Webb took most of the work during the sliver of practice reporters were allowed to see. Ponder, who is recovering from a hip pointer suffered in last weekend's loss to Denver, did little the open portion of practice but said he got some work in team drills.

"(Ponder) still has some soreness," Frazier said. "But being able to see him drop back, deliver the ball, have his accuracy, moving around a little bit -- that was encouraging, because (Thursday), he was pretty stiff, but his movement was much better (Friday). So, we'll see how he feels (during Saturday's walkthrough) as well when we're throwing the ball around."

If Ponder can't start on Sunday, Webb would make his first start at quarterback since last season's finale at Detroit.

With the exception of cornerback Chris Cook, who remains on paid leave, everyone on the Vikings' 53-man roster was on the field for practice. That included halfback Peterson, who has missed the past two games with a high ankle sprain and returned to practice on Thursday.

"He was able to cut better," Frazier said. "Still has a little bit of a gait when he runs, but he was much better than (Thursday)."

Peterson said he's about 80% healthy but will push to play if he feels he's not going to put himself at risk for further injury.